public function test_clone()
{
$model = $this->get_model();
$model_attribute = 'some_date';
$datetime = new DateTime();
$datetime->attribute_of($model, $model_attribute);
$cloned_datetime = clone $datetime;
// Assert initial state
$this->assert_false($model->attribute_is_dirty($model_attribute));
$cloned_datetime->add(new DateInterval('PT1S'));
// Assert that modifying the cloned object didn't flag the model
$this->assert_false($model->attribute_is_dirty($model_attribute));
$datetime->add(new DateInterval('PT1S'));
// Assert that modifying the model-attached object did flag the model
$this->assert_true($model->attribute_is_dirty($model_attribute));
// Assert that the dates are equal but not the same instance
$this->assert_equals($datetime, $cloned_datetime);
$this->assert_not_same($datetime, $cloned_datetime);
}
